FlexDMD.js for PinballY: Handle to dmddevice.dll is not freed when entering a table

[jueank]

It's great to have this script in PinballY and to be able to have something worthwhile to show on the DMD while using PinballY.
However - when entering a table (starting VPX & VPinMAME) the handle to dmddevice.dll (dmddevice64.dll) is not freed by the script. That means VPinMAME cannot use the DMD device. As a result, the DMD stays black. At least that is what's happening on my side. I hope this can be resolved with a few lines of code.